Wireless Version V5.0+EDR Sensitivity 105±3dB/mW(S.P.L at 1KHz) Life time 50 hours (minimum volume) Battery Capacity 200 mA rechargeable Li-ion battery Charging time 1 hours Charging Voltage 5V/1A Standby time 300 hours Speaker size 40mm Working Frequency 2.402-2.480GHz Work Distance 10m